Why did I develop cold urticaria when I never had it before? I used to be able to swim in very cold water and play out in the snow. Recently, about two years ago I noticed that everytime I went out in the cold or swam in a pool or ocean I developed hives all over. Not only were they embarassing but they itched and I could feel my body tense up. I just can't seem to understand how this developed. I have heard that it only lasts about 4-6 years. Any ways to help cure cold urticaria?